GCSE Maths

Has anyone else got their maths exam today?
Its my best subject so im quite looking forward to it, will be very upset if i don't get an A!
The only thing i struggle with is the cosine rule, anyone got any tips?

Good luck to everyone who is doing GCSE's and A levels atm!

Ah trigonometry. Never did get that myself.

The rest of the paper wasn't hard when I did it [2 years ago], so you should be able to get an A fairly comfortably without getting it completely. You should be fine.

I'm doing A-levels myself atm, no maths though (Biology, psychology, English Language). :3

Good luck all =o

Maths and further maths at ALevel (all hopefully to an A grade) and i'm going to do maths at uni.



Maths is great and i hope you do well.

wow! I failed! english and languages were my thing.. never could get the hang of that adding up lark. good luck in your exam!

Is no-one going to explain the cosine rule?

twat-ers wrote:Is no-one going to explain the cosine rule?

Not without pictures lol. Ummm from memory isnt it  c^2 = a^2 + b^2 - 2abcos C where C = the angle between a and b.

EDIT: got sign wrong lol

...........................................C......................................................................................................................................................./.\.......................................................................................................
........................................./....\.....................................
...................................b.../.......\...a...................................
....................................../ .........\ ...................................
...................................../_______ \...................................
...................................A.......c......B.................................

Big letters are angles, small letters are sides.

Then follow the formula:

c^2 = a^2 + b^2 - 2*a*b*cosC


Edit: i give up on the triangle. Matching big and small letters go opposite one another.

(KIA, your sign was wrong...)

Hmm. I made a perfect triangle, and that's what happens...

...............A................
............../..\............
............/......\..........
........c./.........\.b.........
........./............\........
......../_________\....
......B.......a........C

Thanks, i'll edit again...

Ah GCSE Maths. THe highest i got was a B in the final exam and an A in the modules. Trigonometry wasnt the hardest thing i did though.

Had a good way of remembering SOH-CAH-TOA too

Jasperking wrote:
Had a good way of remembering SOH-CAH-TOA too

silly old hags can always have tea on aeroplanes?

not that exact one but thats a good one too :p

just did my exam of civil law and computer sience.

I'm back from my exam and due to the hard revision this morning, i mastered the cosine rule and recurring decimals.
I reckon im pushing for an A*, very confident that i got 80+ out of 100.
Only a couple of questions i couldn't really answer!
1. Solve the inequality 2x+3 > 4x+5 ?
2. Solve the equation 2xsquared +3x +7 = 0

And the back page wordy one which i cant remember and don't want to.